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Abstract

Incremental motion with fluid controlled deceleration is achieved by pistons 10, 11 and 12 which are successively brought into engagement with toothed stepping wheel 13 fixed to output shaft 14.

Country

United States

Language

English (United States)

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Control For Hydraulic Drive

Incremental motion with fluid controlled deceleration is achieved by pistons
10, 11 and 12 which are successively brought into engagement with toothed
stepping wheel 13 fixed to output shaft 14.

At any given time only one of the pistons is driving wheel 13. Pistons 10, 11
and 12 are actuated by fluid under pressure controlled by magnetically operated
spool valves 15, 16 and 17. Valves 15, 16 and 17 are successively actuated by
magnets 18, 19 and 20 to admit fluid under pressure to the cylinders containing
slidable pistons 10, 11 and 12. Each piston advances wheel 13 and then dwells
so as to provide intermittent rotary motion. The speed of operation is dependent
upon the rate at which valves 15, 16 and 17 are operated.

Fluid controlled deceleration is obtained through spring-biased damping
pistons 21, 22 and 23 associated with and adapted to be engaged by pistons 10,
11 and 12. Pistons 21, 22 and 23 are urged to follow the associated drive
pistons. The movement, however, is limited by stop pins 24. Hence, when
piston 12 reaches the end of its driving stroke, it is out of engagement with
associated piston 23. As piston 11 is driven by fluid under pressure, piston 12 is
cammed out of the notch of wheel 13. After moving a given distance, piston 12
engages piston 23. At this time, fluid trapped behind the damping piston is
forced to flow through orifices 25 and 26. A decelerating torque is therefore
placed upon wheel 13. As piston 12 contin...